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| Refining District Indiana-Illinois-Kentucky Isobutane-Isobutylene Stocks at Natural Gas Processing Plants (Thousand Barrels) | ||||||||
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1993 | 15 | 14 | 14 | 14 | 16 | 14 | 14 | 14 | 14 | 14 | 18 | 16 |
| 1994 | 15 | 16 | 14 | 14 | 14 | 15 | 14 | 15 | 15 | 14 | 15 | 17 |
| 1995 | 13 | 13 | 15 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 |
| 1996 | 14 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 15 | 16 | 15 |
| 1997 | 14 | 14 | 15 | 15 | 18 | 17 | 17 | 15 | 17 | 16 | 15 | 18 |
| 1998 | 17 | 17 | 17 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 15 |
| 1999 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 15 | 15 | 15 | 15 | 15 |
| 2000 | 15 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 21 |
| 2001 | 19 | 25 | 21 | 17 | 17 | 17 | 17 | 22 | 18 | 21 | 17 | 20 |
| 2002 | 24 | 22 | 21 | 16 | 21 | 21 | 19 | 21 | 27 | 18 | 19 | 20 |
| 2003 | 20 | 24 | 15 | 22 | 24 | 23 | 23 | 24 | 22 | 28 | 19 | 18 |
| 2004 | 27 | 49 | 73 | 20 | 20 | 19 | 27 | 33 | 18 | 21 | 27 | 17 |
| 2005 | 33 | 31 | 21 | 19 | 20 | 26 | 28 | 26 | 17 | 27 | 25 | 22 |
| 2006 | 22 | 26 | 25 | 23 | 34 | 35 | 27 | 39 | 24 | 25 | 23 | 24 |
| 2007 | 24 | 26 | 28 | 30 | 30 | 32 | 24 | 37 | 38 | 24 | 19 | 27 |
| 2008 | 26 | 25 | 31 | 26 | 24 | 30 | 23 | 31 | 26 | 25 | 26 | 22 |
| 2009 | 30 | 34 | 44 | 42 | 47 | 64 | 41 | 38 | 41 | 41 | 46 | 34 |
| 2010 | 39 | 49 | 44 | 42 | 51 | 42 | 62 | 52 | 48 | 55 | 57 | 55 |
| 2011 | 56 | 55 | 66 | 52 | 53 | 51 | 54 | 45 | 55 | 53 | 39 | 37 |
| 2012 | 44 | 39 | 47 | 45 | 40 | 47 | 41 | 43 | 52 | 56 | 46 | 52 |
| 2013 | 46 | 55 | 51 | 57 | 38 | 45 | 51 | 45 | 44 | 46 | 57 | 46 |
| 2014 | 70 | 65 | 67 | 86 | 76 | 84 | 87 | 90 | 89 | 78 | 63 | 70 |
| 2015 | 73 | 72 | 69 | 72 | 92 | 86 | 70 | 70 | 84 | 84 | 61 | 66 |
| 2016 | 85 | 71 | 68 | 68 | 95 | 105 | 139 | 142 | 145 | 150 | 112 | 117 |
| 2017 | 75 | 73 | 101 | 109 | 112 | 106 | 115 | 150 | 125 | 158 | 157 | 151 |
| 2018 | 99 | 75 | 77 | 88 | 126 | 136 | 178 | 186 | 173 | 167 | 138 | 139 |
| 2019 | 111 | 85 | 89 | 91 | 91 | 110 | 136 | 153 | 118 | 81 | 68 | 73 |
| 2020 | 68 | 73 | 84 | 65 | 76 | 104 | 99 | 104 | 155 | 104 | 114 | 152 |
| 2021 | 102 | 90 | 108 | 171 | 193 | 243 | 260 | 58 | 74 | 69 | 52 | 72 |
| 2022 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2023 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2024 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2025 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2026 | -- | -- | ||||||||||
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 4/30/2026 |
| Next Release Date: 5/29/2026 |